We have used the model to contrast the electrical properties of a passive Purkinje cell dendrite with those of a dendrite with the active properties just described. Figure 12 shows the effect of including voltage-dependent conductance on the electrotonic structure of the model. In this figure, Sholl diagrams  are presented in units of electrotonic length of the Purkinje cell under different conditions. At the right side, enlargements show the electrotonic lengths of a few distal branchlets in a passive membrane model (no active conductances in the model; Fig. 12B) and in an active membrane model during and after a dendritic spike. One can see that adding active membrane to the cell roughly doubled its electrotonic size during the resting state shown in Fig. 12C (the dendritic membrane had a potential of about -60 mV) and that during a dendritic spike the electrotonic size was roughly doubled again (Fig. 12D). The electrotonic distance from the soma to the marked dendritic tip (morphological distance 392 μm) was 0.57 λ in the passive model; it was 0.95 λ in the active model in the resting state and 1.57 λ in the active model during the dendritic spike.